Hinged closure for container

The invention relates to a hinged closure for a container, this closure including a ring designed to fit over the edge of the opening of the said container, as well as a lid connected to the ring by a hinge and pressing against this ring in the closed position.

The patent FR 2,529,865 already relates to a hinged closure for a container of oblong cross-section with a ring sealed on the edge of the opening of the container and a lid connected to the said ring by a hinge. This closure comprises a locking system with a protrusion on the said ring which is designed to engage in a hole in the lid: the drawback of this solution is that when the lid is closed, it is very difficult to open it because it is not known a priori how to disengage the protrusion.

The object of the present invention is to find a hinged closure system which gives easy opening for the user, while at the same time guaranteeing good sealing, both primary and secondary. Primary sealing is understood to be sealing before first opening and secondary sealing is understood to be that after first opening.

The invention relates to a hinged closure, according to the preamble of claim 1, in which the ring includes, on the opposite side to the hinge, a locking tab with a tab, hinged onto the said ring and intended to be housed in a corresponding recess in the lid, the said tab clipping into an indent situated in the top of the recess of the lid upon closure.

A container, in the present description, is understood to be a container of substantially rectangular or square cross-section, so that the lid and the ring are substantially rectangular or square. If the container is of rectangular cross-section, the two hinges are along the length of the said rectangles. It would also be possible to have a container of substantially elliptical cross-section, in which case the lid and the ring are also rectangular and the hinges are parallel to the major axis of the ellipse.

The container may be used for packaging any pasty, granular or powdered product, particularly instant coffee. It is clearly understood that it can also be used for packaging cosmetic products. The container is preferably made of glass or an equivalent product, and the hinged closure made of polypropylene, polyolefin or polystyrene, preferably polypropylene. The hinged closure according to the invention may be made as a single piece or as two pieces (lid and ring) and it is moulded or injection-moulded.

The fact that, according to the invention, there is a locking tab with a tab clipping into an indent in the lid makes it possible to have visual security of closure, because the closing of the said tab can be clearly seen, and the security of closure is also audible, because clipping gives out a noise which also guarantees correct closing.

On the edge of the opening of the container, before first opening, there is provided a membrane which is either sealed or glued or welded, and which can easily be peeled off if necessary. When the container has been opened for the first time, secondary sealing has to be guaranteed so as to minimize the risks of organoleptic deterioration of the product contained in the said container.

To achieve this, it is necessary to provide inside the lid an inner skirt against which a seal rests. The seal is made of foam or of foam/board composite. The foam is made of polyethylene which may or may not be coated with polyethylene or with polypropylene. The foam needs to have a certain compressibility and a density of between 150 and 250 kg/m 3 . This seal has a thickness of between 1 and 4 mm.

To improve the guarantee of closure still further, it is possible to provide in the recess of the lid, beside the locking indent, a boss which is parallel to the said indent and of the same length as it. By comparison with the width of the recess in the lid and hence with the width of the locking tab, the tab is substantially one third of this width. The indent and the boss hence have substantially the same dimensions.

The rest of the description is given with reference to the drawings, in which

FIG. 1 represents a perspective view of the hinged closure according to the invention,

FIG. 2 is a diagrammatic representation of the hinged closure arranged on a container in the open position,

FIG. 3 is a part median section of the hinged closure according to the invention, in the closed position,

FIG. 4 is an enlargement of the part A of the section according to FIG. 3,

FIG. 5 is an enlargement of the part B of the section according to FIG. 3,

FIG. 6 is an enlargement of the part C of the section according to FIG. 3 in a second embodiment, and

FIG. 7 is a partial median section of the closure according to the invention with the ring and the lid made as a single piece.

The hinged closure (1) includes a ring (2) designed to fit over the edge of the opening of a container and a lid (3) connected to the said ring by a hinge (4). The lid (3) comprises an end (5), a skirt (6) and a recess (7) with an indent (8) arranged close to the end (5) of the said lid. The ring (2) comprises an outer skirt (11) and an upper edge in two parts: the outer part (12) against which the lower border (13) of the said lid (3) will rest when the lid (3) is closed, and a raised border (14) which also includes catches (15), numbering 4 in the present embodiment. These catches, when the hinged closure is fitted, make it possible to ensure that the said closure is held fast on the edge of the opening of the container. According to the invention, there is provided on the ring, on the opposite side to the hinge (4), a locking tab (9) of width substantially equal to the width of the recess (7) in the lid, this locking tab (9) including a tab (10) intended to be housed in the indent (8) in the lid. The locking tab is hinged onto the said ring (2) using a hinge (20). Finally, a seal (18) is provided in the lid (3); this seal is held in place by virtue of catches (19) (FIG. 3).

The operation of the closure will be better understood with relation to FIG. 2, showing the said closure on the container (16). First of all, the ring (2) has to be forcibly fitted onto the upper edge (17) of the opening of the said container. If we start from the open position, as represented in FIG. 2, the lid (3) has to be pivoted about the hinge (4) in a closing direction until the lower part of the skirt (6) presses on the outer part (12) of the edge of the ring (2). The raised part (14) ensures that the closure is held fast on the neck of the container. All that is then required is to push the locking tab (9) towards the closed lid, so that the tab (10) clips into the indent (8).

FIGS. 3 to 5 are partial sections of FIG. 2 and to a large extent use the same elements of the first two Figures: these Figures show an embodiment with a ring and a lid made in two parts. We shall consequently limit ourselves to explanations not yet given with respect to the said first Figures. Clearly visible in FIG. 3 is an inner skirt (21), against which the seal (18) rests, the said seal being held in place by virtue of the catches (19). FIGS. 4 and 5 clearly show the container (16) with the upper edge (17) and on the neck a rim (22) holding the ring (2) fast to prevent it from coming off upwards, and a rim (23) making it possible to prevent the said ring from slipping down.

With reference to FIG. 3, it is possible to see the tab (10) clipped into the indent (8). Furthermore, it is also possible to see that the seal (18) requires a certain degree of elasticity to allow it to be compressed between the inner skirt (21) of the lid and the upper edge (17) of the container (16), thus ensuring good sealing.

With reference to FIG. 4, it can clearly be seen that the lower part (12) of the ring (2) will serve as a limit stop against the rim (23) of the container to prevent the said ring from slipping down and that the raised part (14) of the said ring will butt against the rim (22) of the container to prevent any possibility of the said ring coming off the neck of the said container.

With reference to FIG. 5, it is clear that we have a ring (2) and a lid (3) made as two parts: what happens is that the lid (3) pivots about the hinge (4) and has an extension (24) which clips over the ring (2).

FIG. 6 is an enlargement of the locking tab with its tab (10) and the indent (8) in which it is housed, according to an embodiment which differs from the preceding Figures. To improve the guarantee of closure still further, an additional boss (25) is provided in the lid (3), beside the indent (8). The tab (10) is thus positioned in the indent (8) and, to open it, an additional force is required to get over the boss (25).

FIG. 7 shows the container (16) capped by a hinged closure (30) made of a single piece. The ring (31) bears a lid (32) which is hinged on using a hinge (33), the lid including an inner skirt (34). The seal is not represented in this Figure. The ring (31) includes a locking tab (35) pivoting about the hinge (36), the said tab comprising a tab (37) which clips into the indent (38) located in the recess (39) in the lid (32).

In the closure according to the invention, we have the lid and the locking tab which both include hinges. It is quite obvious that the plastic used must be able to be strong enough to withstand at least 300 opening operations without breaking. Polypropylene is satisfactory in any case. However, it is quite obvious that other materials could also serve this purpose.